docs: def set_rgb_points(self, rgb_points, *args):
          """Set rgb points part of cHRM chunk"""
          if not args:
              self.rgb_points = rgb_points
          # separate tuples
          elif len(args) == 2:
              self.rgb_points = (rgb_points, args[0], args[1])
          # separate numbers
          elif len(args) == 5:
              self.rgb_points = ((rgb_points, args[0]),
                            (args[1], args[2]),
                            (args[3], args[4]))